3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $arr = ['one' => 1, 'two' => 2]; echo $arr['ass']; echo $arr['ass'] ?? 'abc';
based on kvVhZ
Output for hhvm-3.15.4, 7.0.0 - 7.3.0rc3
Notice: Undefined index: ass in /in/9GBA9 on line 5 abc
Output for 5.6.0 - 5.6.30
Parse error: syntax error, unexpected '?' in /in/9GBA9 on line 6
Process exited with code 255.